the same to me
I use the wdk 6001.18002 Build Utility to build the example, receive the same answer.
Then I checked the 'source' file, found the path 'TARGETLIBS=\
..\..\..\generic\obj$(BUILD_ALT_DIR)\$(CPU)\generi c.lib \
$(DDK_LIB_PATH)\usbd.lib' was wrong, it seams the writer haven't changed it when the directory tree was changed. so you can simply fix it, it will be ok! the same to 'INCLUDES=..\..\..\generic'.